Oxygen lance with multi-orificed nozzle

ABSTRACT

An oxygen lance with a multi-orificed nozzle or tip in the form of a casting where the tip has a plurality of three oxygen orifices about an inner circumference or ring of the nozzle interface or outer wall and a plurality of five oxygen orifices on a concentric outer circumference of the nozzle interface where each orifice of a ring is symmetrical to the other in the same ring but not in the other ring but the spacing of two adjacent orifices on different rings presenting an angle between two nozzle face radii that pass through the centers of two adjacent holes on different adjacent concentric circles that is a maximum angle for least jet spray interference between such two orifices and maximum cooling of the nozzle interface and wherein the nozzle water shelf above the interface is ported to the inside of the nozzle interface to allow coolant within the interior of the nozzle between the oxygen passages as well as on the outer side of the passages of the ringed orifices.

United States Patent [191 Rymarchyk, Jr. et al.

[ OXYGEN LANCE WITH MULTI-ORIFICED NOZZLE [75] Inventors: Nicholas M. Rymarchyk, Jr.,

Pittsburgh; Walter V. Berry, Lake San Marcos; William W. Berry, Pittsburgh, all of Pa.

[73] Assignee: Berry Metal Company, Harmony,

[22] Filed: Mar. 27, 1972 [21] Appl. No.: 238,136

[52] US. Cl. 266/34 L, 239/1323 [51] Int. Cl C2lc 7/00 [58] Field of Search 239/1323; 266/34 L [56] References Cited UNITED STATES PATENTS 2,807,506 9/1957 Gehring 239/132.3 3045997 7/1962 Hudson 266/34 L 3,662,447 5/1972 Schweng et al 239/1323 FOREIGN PATENTS OR APPLICATIONS 237917 7/1969 U.S,S.R. 266/34 L 1,200.207 7/1970 Great Britain 266/34 L 1.190.137 4/1970 Great Britain 266/34 L [451 Mar. 19, 1974 1,070,049 5/1967 Great Britain 239/1323 Primary Examiner -Gerald A. Dost Attorney, Agent, or FirmRichard J. Myers [5 7] ABSTRACT An oxygen lance with a multi-orificed nozzle or tip in the form of a casting where the tip has a plurality of three oxygen orifices about an inner circumference or ring of the nozzle interface or outer wall and a plurality of five oxygen orifices on a concentric outer circumference of the nozzle interface where each orifice of a ring is symmetrical to the other in the same ring but not in the other ring but the spacing of two adjacent orifices on different rings presenting an angle between two nozzle face radii that pass through the centers of two adjacent holes on different adjacent concentric circles that is a maximum angle for least jet spray interference between such two orifices and maximum cooling of the nozzle interface and wherein the nozzle water shelf above the interface is ported to the inside of the nozzle interface to allow coolant within the interior of the nozzle between the oxygen passages as well as on the outer side of the passages of the ringed orifices.

11 Claims, 7'Drawing Figures SHEET 3 BF Q PMEMEMAR 1 9 @974 2 3 m xi OXYGEN LANCE WITH MULTI-ORIFICED NOZZLE BACKGROUND OF THE INVENTION 1. Field of Invention This invention relates to the construction of nozzles or tips of oxygen lances used in basic oxygen furnaces or the like.

2. Description of the Prior Art Oxygen injection lances and nozzles or tips therefor, as presently known, are disclosed in many U. S. patents. Multi-orificed nozzles are shown in such Berry patents as U. S. Pat. No. 3,043,577; U.S. Pat. No. 3,201,104; and U.S. Pat. No. 3,430,939, which are hereby incorporated herein by reference thereto. Also included amongst related prior art patents are the Zimmer U. S. Pat. No. 3,338,570 and the Stephan Pat. No. 3,41 1,716.

In the prior art conventional oxygen orifice orientation shows the orifices to be on a ring centered on the lance tip outer face facing the molten bath of metal. However. for lance tip integrity the number of orifices or holes are limited for a given size tip. For example, four holes is the maximum that can be placed efficiently on a 10-inch lance; five holes is the maximum for a 12-inch lance; seven holes the maximum for a 14- inch lance. In the case where the number of holes exceeds the lance design it is necessary to consider an alternate arrangement. This invention does consider such an alternate arrangement for greater delivery rate'of oxygen flow to the melt as well as provides for effective cooling of such a designed tip.

SUMMARY OF THE INVENTION With increased demands for more extensive steel making in the basic oxygen furnace, greater quantities of oxygen are required to be delivered by the lance in the furnace. It is, therefore, an object of this invention to provide for lance nozzles that deliver a greater quantity of oxygen in jet stream fashion from the orifices of the nozzle.

The number of holes required for a given application is determined by the total oxygen flow rate divided by the ideal flow rate per hole or orifice. This brings us to the question of hole orientation and distribution, for, in establishing the number of holes or oxygen orifices in the nozzle, one must then determine the orientation of these holes or jets on the nozzle or tip face. The conventional hole orientation shows the jets to be on a ring centered on the tip face. However, because of the construction of the lance tip size and the cooling requirements for the lance nozzle to provide for lance tip integrity, the number of holes per tip size is limited. It is, therefore. a further object of this invention to provide for a lance design that has an improved hole arrangement utilizing two concentric hole or orifice rings which reduces the exposed area of the tip face and, therefore, a more economical design with less heat load per unit area results.

A further object of this invention is to place the holes on each ring in a symmetrical relation to one another but not necessarily symmetrical to the holes on the other ring and this is achieved by an efficient design which provides that the angle between two nozzle face radii that pass through the center of two adjacent holes on adjacent concentric circles that is a maximum angle for least jet spray interference between two such holes or orifices and maximum cooling of the nozzle interface. A minimum of jet interaction and an efficient manner for water cooling is necessarily attained with such a design.

The design provides for a proper linear distance between the jets and, therefore, reduces the jet interaction.

A further object of this invention is to provide for an efficient cooling passage for the tubular or cylindrical portions of the oxygen jet passages within the nozzle whereby the coolant provides for a turbulent flow across the cylindrical bodies or oxygen passages since turbulant flow across a cylindrical body creates a stagnant area behind the body such that inefficient cooling results which leads to a burn-out in this area. The inventive design of spacing of orifices on inner and outer circles utilizes the streamline created by the cylindrical bodies on the inner hole ring to best advantage on the outer circle, that is, the stagnant areas (where water cannot flow well) are minimized when the angle between two nozzle face radii. as aforesaid. is minimized. A furthe object in order to eliminate any remaining dead water zones or stagnant areas is to require the placement of specially shaped and sized ports at strategic locations in the water shelf portion of the nozzle which water shelf is also specially profiled to maintain a constant cooling velocity to compensate for radial spread of the water stream. It is an object of this invention design to provide for the lower water chamber between the water shelf and the interface wall of the nozzle to be narrower at its outer ends than in the center and that further triangulated roof-like openings are provided in the shelf to aid in cooling in their areas but not to act as a by-pass.

It is a further object of this invention to provide for a pair of concentric multi-holed oxygen orificed rings wherein there is provided for three symmetrically spaced orifices on the inner ring and five symmetrically spaced orifices on the outer ring where the angle between the aforesaid two nozzle face radii of two adjacent orifices on different rings is maximized.

These and other objects and advantages will become apparent from reference to the following description, the appended claims and the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lance nozzle;

FIG. 2 is an elevational view of such nozzle;

FIG. 3 is a bottom plan view taken along line 33 of FIG. 2;

FIG. 4 is a top plan view taken along line 4-4 of FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a vertical sectional view in perspective of the lance nozzle; and

FIG. 7 is a sectional view taken along ine 7'-7 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT With reference now to the drawings, it is seen that FIGS. 1-4 show various views of a particular type of lance nozzle or tip 2 which is connected to the upper portion of the lance body 4 which is partially shown in section in FIG. 5 and includes the usual three concentric walls, namely, the outer wall 6, the intermediate wall 8 and the inner wall of three concentric cylindrical bodies 6a, 8a and 10a respectively. The inner cylindrical body 10a defines the inlet oxygen passage 12 for introducing oxygen into the nozzle or tip 2. The passageway formed between the cylindrical body 8a and the cylindrical body 10a is an inlet coolant or water passage 14 for directing water to the nozzle coolant area 16 between the nozzle cylindrical bodies or tubes 18 that define the oxygen conduits or passages 20 in the lance nozzle 2. The cylindrical bodies 6a and 8a define the coolant or water exit passages 22. The protuberances 24, seen for instance, in FIGS. 1 and 5, provide for alignment of the nozzle to the cylindrical portions of the lance. The flow of oxygen between the cylindrical portions of the lance and the nozzle as well as the flow of coolant between the lower lance portions and the nozzle is of a conventional manner as discussed, for instance, in the aforementioned Berry U. S. Pat. No. 3,430,939. The flow of oxygen passes through the central cylindrical body 10a into the conduits or columns 18 of the nozzle while being cooled by the coolantor water in the inlet and outlet passages of the upper lance body 4 and the lance tip 2 when the lance is disposed within the basic oxygen furnace over a molten bath in the conventional manner to make steel in the basic oxygen furnace process.

The nozzle is provided with three concentric cylindrical bodies, one within the other, that is, the outer cylindrical or annular body portion 26 which connects by welding W, to the upper cylindrical wall portion 6, the intermediate cylindrical or annular wall portion 28 which couples with the upper intermediate cylindrical wall portion 8 of the lance, and the inner cylindrical annular portion 30 which is aligned with the cylindrical wall portion 10 by the aligning bodies or protuberances 24 and welded to protion 10 by weld W The inner body portion 30 projects above the intermediate portion 28 which projects above the outer portion 26. The inner cylindrical body portion 30 forms the continuation passage 32 for passage of oxygen from the upper passage 12 and the space between the inner cylindrical portion 30 and the intermediate cylindrical portion 28 defines the annular continuation inlet coolant or water passage 34 of the coolant space 16 and the intermediate cylindrical wall portion 28 and the outer cylindrical wall portion 26 defines the annular continuation water coolant exit passage 36 of the water coolant area 16. The entire nozzle is a casting of copper or copper alloy in which the outer cylindrical portion 26 is integrated with but spaced from the intermediate cylindrical body portion 28 by short vertical spacer elements 38, as seen in FIG. 1, and wherein the intermediate and inner cylindrical bodies 28 and 30 are spaced from one another by upper spacer elements 40, as seen in FIG. 1.

The inner cylindrical body portion defining the oxygen passage 32 has an upright bowl shaped portion or base 42 which has an inside upper facing bottom portion 44 and an underside 46 from which extend the hollow leg portions or tubes 18 which at their upper end are oxygen inlet openings of the oxygen passages 20. The bowl portion 42 and the upper portions of the leg 18 extend above the intermediate portion 28. Each of these legs 18 from convergent oxygen passages 20 of the DeLaval type and at a conventional angle to the central axis of the oxygen inlet cylindrical body or passage 12. Each of these passages 20 extends downwardly and forms an exit opening in the outer lower face wall or interface wall '48 of the nozzle. The interface wall 48 is that wall or interface member of the nozzle that has its outside face exposed to the high temperature atmosphere within the furnace and has its inner face exposed to the water coolant directed into the nozzle. As viewed, for instance, in FIG. 3, there is shown three such orifices or passages 20 (designated as upper left passage 20a, upper right passage 20b, and lower passage 20c) that all lie on an inner circle 51 of the outside face or surface 50 of the interface wall 48, and there are five such orifices 20 (designated as upper orifice 20d, left central orifice 20s, right central orifice 20f, left lower orifice 20g, and right lower orifice 20h) lying on an outer circle 53 that is concentric with the inner circle 51. The outer face or interface 50 is somewhat pentagonal in shape and is adjacent five outer segmental or arcuate surfaces 55 which form the bottom of the interface wall of the casting or tip 2. The interface wall or bottom wall 48 joins with the outer cylindrical or annular body 26 and an intermediate curved upright bowl portion or water shelf 56 connects with the intermediate cylindrical wall portion 28 to form therewith a divider between the inlet water passage 34 and the outlet water passage 36, said water shelf being apertured for extension of the legs 18 therethrough for connection with the interface wall 48. Consequently, the bowl shaped portions 42, 56 and 48 are more or less horizontal and are parallel to one another and relatively flattened out and define the coolant flow area 16.

The water shelf 56 is a recipient of the incoming coolant and acts as a divider or deflector which baffles the coolant around the legs 18, the baffle water shelf 56 being suitably ported intermediate the legs 18 and at the legs 18 to provide for passage of the coolant along the legs into the lower coolant chamber 36 and allow the water to flow on the inside surface 480 of the interface wall for cooling of the interface wall.

The placement of the oxygen emission passages 20, as defined by the legs 18 with respect to one another is, important in properly channeling the jets of oxygen being emitted from the outer ports 20b of the passages 20 so that the jets of oxygen do not interfere with one another. This desired result has become possible by placing in symmetrical array the three inner oxygen passages 20 on the inner circle 51, that is, each of the inner circle oxygen holes or passages 20 are spaced from one another. Similarly, the outer grouping of the five orifices or oxygen passages 20 on the outer circle 53 are symmetrically disposed with respect to one another on the outer circle 53 so that 'each oxygen orifice on the outer ring 53 is spaced 72 from the one adjacent to it on the outer ring 53. However, the orientation of an oxygen orifice or passage 20 on an outer ring is fixed with respect to an oxygen passage 20 on the inner ring that is most adjacent to it such that their radii which also pass through the center 0 of the nozzle rip define an angle alpha (a) between them which is of maximum degrees to provide for minimum jet interference and to allow for maximum passage of water coolant between them. In FIG. 3 it is seen that with respect to orifices designated as 20a and 20e, the angle alpha is shown to be less than the angle alpha between the orifices 20g and 20s. 'Thus it is seen that the inner and outer orifices are not necessarily symmetrical to one another and the angle alpha between respective adjacent inner and outer orifices may vary but' the angle should be such as to be maximized to put the greatest distance possible between a set of adjacent inner and outer orifices to provide for minimum jet interference and maximum water cooling.

With reference to FIG. 3, the degrees of angle alpha between the two orifices radii at orifices 20a and 20:: is about the same as the angle alpha between orifices 20b and 20f whereas the angle alpha between 200 and 20g is about the same as between 200 and 20h. The angle alpha between the radii of orifice 20a and 20d and between 20b and 20d are about the same amount of degrees and both such angles alpha are the largest of all of the other alpha angles. The angles alpha between 20a and 20e and between 20b and 20f cannot be any greater in value because then either the internal symmetrical arrangement of the orifices on each ring would be disturbed or the orifices in one orbit would be too close to the orifices in the other orbit as to cause an interference between the various jets of oxygen coming out of the orifice when considering this pentagonal arrangement where you start out with an orifice like 20d at 12:00 oclock where the face 52 is viewed as the face of a clock, as seen in FIG. 3. Such an orientation of the nozzle orifices provides for a minimum jet interaction and an efficient manner of water cooling. Naturally, the closer the orifices are together, whether in the same or different orbits, the greater will be the jet interaction and, therefore, interference to prevent proper outward spray of the oxygen into the bath.

The fact that the linear distance between jets is a function of jet interaction needs no further explanation. However, the water cooling paths require additional consideration and for this, attention is directed to FIG. 7 which shows the same orifices 20 orientated in the same fashion as in FIG. 3 but taken at a section just above the water porting arrangement to provide for the efficient manner of water cooling. Turbulent flow across a cylindrical body creates a stagnant area behind such body such that inefficient cooling results which leads to a "burn-out" in this area. The eight hole or eight orifice design utilizes the streamline created by the cylindrical bodies or tubes 18 at their junctures with the top surface 56a of the water shelf 56 on the inner holed or orificed ring or circle 51 to the best advantage on the outer ring or circle 53, or in other words, the stagnant areas are minimized when the angle alpha is maximized, as referred to above. In order to eliminate the remaining dead water zones, the placing of specially shaped and sized ports at strategic locations in the water shelf 56 is accomplished as best seen in FIG. 7. This water shelf 56 is also specially profiled to maintain a constant cooling water velocity to compensate for the radial spread of the water stream. In this respect it will be noted that the water shelf 56 is provided with two larger triangular shaped water apertures or ports 58 and 60 and two smaller Water apertures or passages 62 and 64 and generally rectangular shaped water passages 66 and 68 between the legs ofinner and outer ringed orifices 20a and 20e and between legs of inner and outer ringed orifices 20b and 20f. The water shelf is further provided with a partially annular arcuate shaped water port 70 on the outside or bottom of the leg 18 of the lower orifice 200 on the inner ring 51 as viewed in FIG. 7. The main centrally located water passage 72 dovetailingly connects with all three legs of orifices a. b. 200 on the inner ring 51 and a plurality of partially annular arcuate segment shaped water passages 74, 76, 78, 80 and 82 is located on the outside of each of the legs of the respective orifices 20d, 20e, 20f, 20g, 20h and adjacent the intermediate cylindrical or annular wall portion 28 which joins with the water shelf 56. As viewed in FIG. 7, it is noted that the water passages 62 and 64 are spaced somewhat near and equidistant between the most upper orifice 20d of the outer ring 53 and the two upper orifices 20a and 20b on the inner circle or ring and the two outer orifices 20e and 20f; whereas the larger water passages 58 and 60 are located somewhat near and equidistant between the outer generally centrally located orifices 202 and 20f on the outer ring and the lower orifices 20g and 20h on the outer ring and the center orifices 20a, 20b, 20c and have more orifice cooling to do than ports 62 and 64. The water passages 66 and 68 are each located between and connect with the legs 18 of a respective pair of inner and outer ring orifices 20a, 202 and 20b, 20f that are located more or less centrally through the nozzle 2. The central water passage 72 connecting the. three orifices on the inner ring provides for the main discharge of the water to the lower interface wall 48 for cooling same. The other water passages and the shelf 56 allow for water to be directed between the orifices and between each orifice and the intermediate wall 28. With such an arrangemennall the orifices 20 are adequately cooled. The particular arrangement and dimension of the water passages, as shown in FIG. 7, is necessary to insure proper cooling of the water shelf 56, the interface 48 and the orifice legs 18. For instance, the larger triangulated water passages 58 and 60 are necessary because they are aiding in cooling more, namely seven, orifice legs 18 that are adjacent to them than the smaller triangulated water passages 62 and 64 which are adjacent only to five orifice legs 18. Also, the water passages 66 and 68 link together the inner and outer ringed orifices 20e, 20a, 20b, 20f on each side of the central passage 72 whereas the semi-circular arcuate passage 70 at the lower orifice 200 of. the inner circle is of sufficient dimension that it need not be linked with the legs of the two lower orifices 20g, 2011 on the outer ring. Water that does not pass through the central passage 72 is able to go around the legs of the orifices 20a, 20b, 200 on the inner circle and into water passages 66, 68 thereat between the inner and outer ringed orifices and also, further water is allowed to go around to the outside of the legs of the outer ringed orifices 20d, 20e, 20f, 20g, 20h and through ports 74, 76, 78, 80, 82 by this novel arrangement of porting so that water passes from the water shelf 56 to the interface wall 48. The placement of the specifically shaped and sized ports at strategic locations eliminates any remaining dead water zones. Also, as seen in FIG. 5, the vertical distance in the central portions of the nozzle between the shelf 56 and the interface wall 48 is greater than the vertical distance between these walls 56 and 48 at the outer end portions of the nozzle to maintain a constant cooling velocity to compensate for the radial spread of the water stream.

The foregoing description and drawings merely explain and illustrate the invention and the invention is not limited thereto. except insofar as the appended claims are so limited. as those skilled in the art who have the disclosure before them will be able to make modifications and variations therein without departing from the scope of the invention.

What is claimed is: i

1. An oxygen lance nozzle for injecting oxygen into high temperature furnace comprising:

a plurality of oxygen orifice means,

a fluid coolant passageway means surrounding said orifice means,

fluid coolant shelf means dividing said coolantpassageway means into an inlet passage means and an outlet passage means,

an interface wall means spaced outwardly of said shelf means and connecting with said orifice means,

said orifice means including a first plurality of port means on an inner annular path on the face of said interface wall means and a second plurality of port means on an outer annular path on the face of said interface wall means, and

said fluid coolant shelf means having a plurality of coolant apertures spaced between the orifice means on the inner and outer annular paths and providing coolant communication between the inlet passage means and the outlet passage means.

2. An oxygen lance nozzle for injecting oxygen into high temperature furnace comprising:

a plurality of oxygen orifice means,

a fluid coolant passageway means surrounding said orifice means,

fluid coolant shelf means dividing said coolant passageway means into an inlet passage means and an outlet passage means,

an interface wall means spaced outwardly of said shelf means and connecting with said orifice means.

said orifice means including a first plurality of port means on an inner annular path on the face of said interface wall means and a second plurality of port means on an outer annular path on the face of said interface wall means.

said inner annular path being an inner circle and said outer annular path being an outer circle concentric with respect to the inner circle,

said fluid coolant shelf means having a central fluid coolant passage communicating with the interface wall means and connecting with each of the port means on the inner circle, and

aperture means in said fluid coolant shelf means being spaced somewhat equidistant between the port means on the inner and outer circles.

3. An oxygen lance nozzle for injecting oxygen into high temperature furnace comprising:

an oxygen inlet chamber having a lower wall,

a plurality of oxygen passage tubes extending downward from said oxygen chamber and communicating therewith,

an inteface wall connecting with said tubes and defining with said lower wall a fluid coolant passageway means for cooling the interface wall and the tubes,

said interface wall providing a plurality of orifice means communicating the outside of the nozzle with the tubes,

said fluid coolant passageway means including a fluid i said shelf being provided with a plurality of port means adjacent the tubes for having fluid communication between the inlet and outlet passage means in the area of the tubes,

said orifice means including a plurality of orifices on substantially an inner ring on the outside face of said interface wall and a substantially outer ring of orifices on an outer circle on the outside face of the interface wall substantially concentric to the inner ring, and

said port means including ports being spaced between the orifices of the inner ring and in the space between the orifices of the inner ring and the orifices of the outer ring.

4. The invention according to claim 1, and

said inner annular path being an inner circle and said outer annular path being an outer circle concentric with respect to the inner circle.

5. The invention according to claim 1, and

said first plurality of port means being symmetrically arranged on said inner annular path and said second plurality of port means being symmetrically arranged on said outer annular path.

6. The invention according to claim 1, and

the arrangement of the port means on the inner annular path being asymmetrical with respect to the arrangement of the port means on the outer annular path.

7. The invention according to claim 1, and

said first plurality of port means including three oxygen emission orifices on the inner annular path and said second plurality of port means including five oxygen emission orifices on the outer annular path.

8. The invention according to claim 1, and

said fluid coolant shelf means having further coolant aperture means being spaced on the outside of each of the port means of said second plurality of said port means.

9. The invention according to claim 1, and

the spacing between the central portions of the shelf means and the interface wall means being of greater extent than the spacing between the .outer end portions of the shelf means and the interface wall means.

10. The invention according to claim 1, and

said orifice means including a plurality of hollow vertical columns, each column having a central oxygen passage,

said fluid coolant shelf means and said columns defining the coolant inlet passage means and said interface wall means,

said columns and said coolant shelf means defining said coolant outlet passage means.

11. The invention according to claim 1, and

an upper oxygen chamber,

a bottom wall for said chamber being ported for oxygen therethrough,

said orifice means including vertical tubes connecting with and extending down from the chamber for communicating with said ported bottom wall for carrying oxygen therethrough and communicating with said first and second plurality of port means,

said fluid coolant shelf means having said tubes extending therethrough and defining with said bottom wall said inlet passage means,

said interface wall means defining-with said fluid coolant shelf means said outlet passage means, and

said tubes extending between and connecting the shelf means and the interface wall means. 

1. An oxygen lance nozzle for injecting oxygen into a high temperature furnace comprising: a plurality of oxygen orifice means, a fluid coolant passageway means surrounding said orifice means, fluid coolant shelf means dividing said coolant passageway means into an inlet passage means and an outlet passage means, an interface wall means spaced outwardly of said shelf means and connecting with said orifice means, said orifice means including a first plurality of port means on an inner annular path on the face of said interface wall means and a second plurality of port means on an outer annular path on the face of said interface wall means, and said fluid coolant shelf means having a plurality of coolant apertures spaced between the orifice means on the inner and outer annular paths and providing coolant communication between the inlet passage means and the outlet passage means.
 2. An oxygen lance nozzle for injecting oxyGen into a high temperature furnace comprising: a plurality of oxygen orifice means, a fluid coolant passageway means surrounding said orifice means, fluid coolant shelf means dividing said coolant passageway means into an inlet passage means and an outlet passage means, an interface wall means spaced outwardly of said shelf means and connecting with said orifice means, said orifice means including a first plurality of port means on an inner annular path on the face of said interface wall means and a second plurality of port means on an outer annular path on the face of said interface wall means, said inner annular path being an inner circle and said outer annular path being an outer circle concentric with respect to the inner circle, said fluid coolant shelf means having a central fluid coolant passage communicating with the interface wall means and connecting with each of the port means on the inner circle, and aperture means in said fluid coolant shelf means being spaced somewhat equidistant between the port means on the inner and outer circles.
 3. An oxygen lance nozzle for injecting oxygen into a high temperature furnace comprising: an oxygen inlet chamber having a lower wall, a plurality of oxygen passage tubes extending downward from said oxygen chamber and communicating therewith, an inteface wall connecting with said tubes and defining with said lower wall a fluid coolant passageway means for cooling the interface wall and the tubes, said interface wall providing a plurality of orifice means communicating the outside of the nozzle with the tubes, said fluid coolant passageway means including a fluid coolant shelf between the lower wall and the interface wall dividing said passageway means into an inlet passage means and an outlet passage means, said shelf being provided with a plurality of port means adjacent the tubes for having fluid communication between the inlet and outlet passage means in the area of the tubes, said orifice means including a plurality of orifices on substantially an inner ring on the outside face of said interface wall and a substantially outer ring of orifices on an outer circle on the outside face of the interface wall substantially concentric to the inner ring, and said port means including ports being spaced between the orifices of the inner ring and in the space between the orifices of the inner ring and the orifices of the outer ring.
 4. The invention according to claim 1, and said inner annular path being an inner circle and said outer annular path being an outer circle concentric with respect to the inner circle.
 5. The invention according to claim 1, and said first plurality of port means being symmetrically arranged on said inner annular path and said second plurality of port means being symmetrically arranged on said outer annular path.
 6. The invention according to claim 1, and the arrangement of the port means on the inner annular path being asymmetrical with respect to the arrangement of the port means on the outer annular path.
 7. The invention according to claim 1, and said first plurality of port means including three oxygen emission orifices on the inner annular path and said second plurality of port means including five oxygen emission orifices on the outer annular path.
 8. The invention according to claim 1, and said fluid coolant shelf means having further coolant aperture means being spaced on the outside of each of the port means of said second plurality of said port means.
 9. The invention according to claim 1, and the spacing between the central portions of the shelf means and the interface wall means being of greater extent than the spacing between the outer end portions of the shelf means and the interface wall means.
 10. The invention according to claim 1, and said orifice means including a plurality of hollow vertical columns, each column having a central oxygen passage, said fluid coolant shelf means and said columns defining the coolant inlet passage means and said interface wall means, said columns and said coolant shelf means defining said coolant outlet passage means.
 11. The invention according to claim 1, and an upper oxygen chamber, a bottom wall for said chamber being ported for oxygen therethrough, said orifice means including vertical tubes connecting with and extending down from the chamber for communicating with said ported bottom wall for carrying oxygen therethrough and communicating with said first and second plurality of port means, said fluid coolant shelf means having said tubes extending therethrough and defining with said bottom wall said inlet passage means, said interface wall means defining with said fluid coolant shelf means said outlet passage means, and said tubes extending between and connecting the shelf means and the interface wall means. 